From Heroes Wiki
A Company agent with the ability of sound absorption is responsible for capturing Echo DeMille.
The agent was especially recruited by the Company to capture Echo DeMille, an evolved human who was evading the Company for 13 weeks. Penny, using her mother's ability to disguise herself as Gina, prepares an ambush for Echo, supported by two other company agents and Elle. Echo finds out, and uses his screams to stun the group. However, he is unable to do so against the agent, which seemed to be unaffected by his sonic attacks. Helpless, Echo is knocked out by him.
Later on, with the help of a sign language interpreter, he is seen on Echo's cell, explaining to Echo how his ability allows him to absorb all sounds, leaving him permanently deaf.
The agent's body has the ability to absorb all sound waves. While this gives him immunity against Echo's sonic attacks, it also leaves him deaf and apparently mute.
- It is unknown whether the agent speaks American Sign Language or another sign language.